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Equity (Valuation Assumptions) (Details) - $ / shares
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Equity [Abstract]    
Risk-free interest rate 1.08% 1.23%
Expected life in years 5 years 5 years
Expected volatility 24.00% 27.00%
Expected dividend yield 1.25% 1.00%
Estimated weighted-average fair value of options granted per share $ 40.94 $ 45.23